Rates of stream incision in the middle part of the Arkansas River basin based on late Tertiary to mid-Pleistocene volcanic ash
Arid area ; Arkansas ; Fluvial erosion ; Lithology ; Pleistocene ; Pliocene ; River bed ; Stream ; Tephrochronology ; United States of America ; Volcanism ; Watershed
Ages and elevations of ash layers correlated with late Tertiary and Pleistocene eruptions in the western US and present stream elevations are used to calculate net rates of incision by streams in the middle reaches of the Arkansas River basin
in the south central US. Major influences on rate of stream incision in the study area include the arid to semi-arid climate of the region, the type of material being incised by streams, stream captures, and salt dissolution in the bedrock that underlies
Bedload tansport during rising and falling stages on two small streams
Gravel ; Ground survey ; Hydrodynamics ; Methodology ; Mississippi ; River bed ; Roughness ; Sediment load ; Stream ; United States
The A. has analysed bed load transport rates during rising and falling stages of two small streams (Godwin Creek Research Watershed, Nothern Mississippi, USA)
Coarse woody debris and channel morphology interactions for indisturbed streams in southeast Alaska, U.S.A.
The AA. examined five low-gradient streams in southeast Alaska in watersheds that were undisturbed by land-use activities. They assessed the interaction between coarse woody debris and channel characteristics to evaluate the role of wood in forming
This paper examines the characteristics of small offset streams in Japan, through the analysis of planform channel course geometry and longitudinal profiles measured in the field. Some configurations characteristic to the deformation types still
Supraglacial stream dynamics on the Juneau icefield
Measurements of discharge, reach morphology, and cross-section morphology in supraglacial streams on the Juneau Icefield reveal controlling variables that have analogous counter parts in alluvial streams.
Six courantomètres mouillés à 100m au-dessus du fond entre 1200 et 4200m, de mai à juillet 1971. Le Gulf Stream ne toucha le fond que pendant de brèves périodes. Débit du WBUC: 2410m/s. (JRV).
Comparison of active and passive stream restoration : effects on the physical habitats
Biogeography ; Channel geometry ; Denmark ; Ecological restoration ; Fish ; Habitat ; Meander ; Model ; Stream
The AA. compare 2 commonly used methods in small Danish streams to improve the physical condition : re-meandering and passive restoration through cease of maintenance. The investigation included measurement of the physical conditions in 29 stream
reaches covering 4 different groups : 1) re-meandered streams, 2) LDC streams (the least disturbed streams available), 3) passively restored streams (>10 years stop of maintenance) and 4) channelized and non-restored streams. The in-stream habitats were
compared through analysis of the measured physical parameters and by applying a habitat model. The AA. found that re-meandering is a more effective way of re-creating near-natural physical conditions in small streams compared to passive restoration. However
Geochemical inventory in the stream sediments over the Palaeozoic formations of Belgium
As a continuation of a stream sediment reconnaissance for uranium in the Palaeozoic of the Belgian Ardennes, a multielement survey is now carried out in the same region. The mean density is one sample per km2 and the area covers 12,000 km2.
The concept of sand waves in stream beds is discussed and the principles for their classification examined. The classification divides waves into two grades| the first covers two subdivisions and the second covers six. Each is defined and described